Bleh that didn't help.
I ran into a similar lag issue on numberous occasions.
I suggest a Spyware, Adware, Virus search to start. Make sure all those search programs are up to date. You may find a deep routed virus etc that is using certain resources.
Also, I got this problem with a few units after a windows update. After uninstalling the most recent updates, and a restart... it was running fine. I then reinstalled the updates and everything ran normal still. I still haven't found out what caused it since I cannot reproduce my exact steps at the time but it's happened on a few occasions which leads me to believe it may be the problem as well.
See if that helps, and keep us informed. Sorry so late, this could already be fixed.
~Trezier